GradientDrawable 类中的innerRadiusRatio 和thicknessRatio 之间存在什么样的联系？
假设我们有一个内半径为 R2 、外半径为 R1 的环。根据文档： 环的内半径以环宽度的比率表示。例如，如果innerRadiusRatio=9，则内半径等于环的宽度除以9 据我了解，这意味着 innerRadiusRatio = 2*R1 / R2。
关于thicknessRatio有： 环的厚度，以环宽度的比率表示。例如，如果thicknessRatio=3，则厚度等于环的宽度除以3。所以厚度比= 2*R1 / (R1 - R2) 。
从这两个方程我们可以得到这个：thicknessRatio*(1-2/innerRadiusRatio)=2这意味着thicknessRatio和innerRadiusRatio之间存在联系。但是 GradientDrawable 类文档中没有任何关于此连接的信息。它们之间似乎没有任何联系，因为我可以设置 widthRatio 和 innerRadiusRatio ，但它不满足最后一个方程。
那么请告诉我我的考虑错在哪里，或者这个参数真正负责什么？
Let's supposed we've got a ring with inner radius R2 and outer radius R1. According documentation:Inner radius of the ring expressed as a ratio of the ring's width.For instance, if innerRadiusRatio=9, then the inner radius equals the ring's width divided by 9
As I understand this means that innerRadiusRatio = 2*R1 / R2.
About thicknessRatio there is that:Thickness of the ring expressed as a ratio of the ring's width. For instance, if thicknessRatio=3, then the thickness equals the ring's width divided by 3. So thicknessRatio = 2*R1 / (R1 - R2).
From this two equationі we can get this one: thicknessRatio*(1-2/innerRadiusRatio)=2 which means that there is a connection between thicknessRatio and innerRadiusRatio. But there is nothing about this connection in GradientDrawable class documentation. And it doesn't seem that there is any connections between them as I can set thicknessRatio and innerRadiusRatio which doesn't satisfying last equation.
So tell me please where I'm wrong in my consideration or what are this parameters really responsible for?
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我知道这已经很晚了，但它可能会帮助其他人寻找这个。
在文档中它说：
环的宽度不是环的半径，而是包含环的视图的宽度。我画这个是为了更简单的解释：
这是内部有环的视图的方案。这些字母的含义是：
我将添加：
该文档实际上描述了以下关系：
因此您可以实际计算半径。
您可以通过创建一个带有环的视图来证明这一点，该环具有：
这将创建一个与视图具有完全相同宽度的环。
注意：前面的所有公式都是在无填充的情况下计算的。如果视图上有填充，则应将每个 W 替换为 (W - P)。
I know this is pretty late, but it may help others looking for this.
In the documentation it says:
The ring's width is not the Radius of the ring, it is the width of the view containing the ring. I draw this for an easier explanation:
That's the scheme of a view with a ring inside. The letters mean:
And I will add:
The documentation actually describes the following relationship:
So you can actually calculate the Radius.
You can prove this by creating a view with a Ring that has:
This will create a ring that has exactly the same width as the view.
Note: All of the previous formulas are calculated with no padding. If there is padding on the View, you should replace every W with (W - P).
比率是两个数字的比较，因此上述两个方程可以重写为
Ratio1 = InnerRadius : 环宽度（其中 Ratio1 = InnerRadiusRatio）
Ratio2 = 厚度 : 环宽度 (其中 Ratio2 = ThicknessRatio)
这意味着...
环宽度 = Ratio1 x 内半径 = Ratio2 x
厚度自从您将其添加到方程中后，就出现了“2”。所有方程式中唯一的共同点是“环宽度”。用真实的数字进行尝试也有帮助。
Ratios are a comparison of two numbers, so the above two equations can be rewritten as
Ratio1 = InnerRadius : Ring Width (where Ratio1 = InnerRadiusRatio)
Ratio2 = Thickness : Ring Width (where Ratio2 = ThicknessRatio)
Which means...
Ring Width = Ratio1 x Inner Radius = Ratio2 x Thickness
The "2" appeared since you added it into your equation. The only common denominator in all equation is "Ring Width". Trying it out with real numbers helps too.